REL02-BP01: Use highly available network connectivity for your workload public endpoints
Overview
Implement highly available network connectivity for your workload’s public endpoints to ensure reliable access for users and external systems. This involves deploying redundant network infrastructure, using multiple Availability Zones, implementing global load balancing, and establishing resilient DNS resolution to eliminate single points of failure in your network architecture.
Implementation Steps
1. Deploy Multi-AZ Load Balancing Infrastructure
- Implement Application Load Balancers (ALB) or Network Load Balancers (NLB) across multiple Availability Zones
- Configure cross-zone load balancing for even traffic distribution
- Set up health checks and automatic failover mechanisms
- Establish load balancer redundancy and backup strategies
2. Implement Global Traffic Management
- Deploy Amazon CloudFront for global content delivery and edge caching
- Configure Route 53 with health checks and DNS failover policies
- Implement geolocation and latency-based routing for optimal performance
- Set up multi-region traffic distribution and disaster recovery routing
3. Establish Redundant Network Connectivity
- Configure multiple internet gateways and NAT gateways across AZs
- Implement VPC peering and Transit Gateway for inter-VPC connectivity
- Set up redundant Direct Connect connections with backup paths
- Establish multiple network paths and eliminate single points of failure
4. Configure Advanced Health Monitoring
- Implement comprehensive health checks at multiple layers
- Set up synthetic monitoring and real user monitoring (RUM)
- Configure automated failover based on health check results
- Establish network performance monitoring and alerting
5. Implement Security and DDoS Protection
- Deploy AWS Shield Advanced for DDoS protection
- Configure AWS WAF for application-layer security
- Implement network ACLs and security groups for defense in depth
- Set up VPC Flow Logs for network traffic analysis
6. Establish Disaster Recovery and Failover Procedures
- Configure cross-region failover capabilities
- Implement automated disaster recovery workflows
- Set up backup DNS resolution and emergency routing
- Establish network recovery testing and validation procedures
Implementation Examples
Example 1: Multi-AZ Highly Available Web Application Architecture
Example 2: Global Multi-Region Traffic Management System
Example 3: CloudFormation Template for Highly Available Network Infrastructure
Example 4: Network Health Monitoring and Automated Failover System
AWS Services Used
- Amazon Route 53: DNS management with health checks and failover routing policies
- Elastic Load Balancing (ALB/NLB): Multi-AZ load balancing with health checks and cross-zone load balancing
- Amazon CloudFront: Global content delivery network with multiple origin failover
- AWS WAF: Web application firewall for application-layer protection
- AWS Shield: DDoS protection for network and application layers
- Amazon VPC: Virtual private cloud with multi-AZ subnets and redundant gateways
- AWS Direct Connect: Dedicated network connections with redundant paths
- Amazon CloudWatch: Network monitoring, metrics, and automated alerting
- AWS Lambda: Serverless functions for automated network management tasks
- Amazon SNS: Notification service for network health alerts
- VPC Flow Logs: Network traffic analysis and monitoring
- AWS Certificate Manager: SSL/TLS certificate management for HTTPS endpoints
Benefits
- High Availability: Eliminates single points of failure in network connectivity
- Global Reach: Provides optimal performance for users worldwide through CloudFront
- Automatic Failover: Intelligent routing based on health checks and performance metrics
- DDoS Protection: Built-in protection against network and application-layer attacks
- Performance Optimization: Edge caching and intelligent routing for reduced latency
- Comprehensive Monitoring: Real-time visibility into network health and performance
- Cost Optimization: Efficient traffic routing and bandwidth utilization
- Scalability: Automatic scaling to handle traffic spikes and growth
- Security: Multiple layers of network and application security
- Disaster Recovery: Cross-region failover capabilities for business continuity